The word ashram means monastery. The word guru means teacher. Of course, these are eastern words of non-Christian origin, and using them usually indicates that you are interested in interreligious dialogue. A Catholic priest can be a teacher (guru) in a monastery (ashram) with the approval of his bishop, or abbot if he is a member of a monastic order.
One goal that interreligious dialogue seeks to find is common ground between different faith traditions. Common ground should not be equated with syncretism, but that is always a possibility. Meditation techniques such as becoming still and focusing the mind can be quite harmonious with Catholic spirituality.
However, if you are put off by the thought of interreligious dialogue and learning from other faiths, then you are free to ignore all of that. If you are worried about syncretism and a potential watering down of the Faith, then you can issue a warning, as many on these forums do.